Coil form casting for printed circuit



April 30, 1957 s. M. DEL CAMP 2,790,961

con. FORM CASTING FOR PRINTED CIRCUIT Filed Sept. 4, 1955 3 INVENTOR. SClPlONE M. DELCAMP United States Patent COIL FORM CASTING FOR PRINTED CIRCUIT Scipione M. Del Camp, Maywood, lll., assignor to Cinch Manufacturing Corporation, Chicago, Ill., :1 corporation of Illinois Application September 4, 1953, Serial No. 37 8,536

3 Claims. (Cl. 339-428) This invention relates to a mounting assembly in which a unit of manufacture such as a coil form is secured to a printed circuit panel by means of metal mounting members carried by the coil form which operate, not only to elfect electrical connection between wire coils and the printed circuit, but, also, to fasten the coil form in initial assembly with the panel.

A further object of my invention is the provision of mounting members constructed to be attached to a coil in a way to effect a firm non-rattle assembly between the mounting members and the casting of the coil form.

Other objects of my invention will be apparent from the drawing and specification hereinbelow set forth.

Referring to the drawing in which I have illustrated a preferred embodiment of my invention,

Fig. l is a top plan view of an installation showing a coil form secured in assembly with a printed circuit panel,

Fig. 2 is a bottom plan of the installation shown in Fig. 1,

Fig. 3 is a side elevation of the installation shown in Figs. 1 and 2,

Fig. 4 is a sectional view taken along the line 4-4 of Fig. 3,

Fig. 5 is a sectional view of the coil form casting shown in Fig. 4, the mounting members being omitted,

Fig. 6 is a front elevation of the improved mounting member per se,

Fig. 7 is a side elevation of the mounting member shown in Fig. 6, and

Fig. 8 is a bottom plan view of the printed circuit panel prior to assembly of the coil form therewith.

Referring to my preferred installation illustrated in Figs. 1 to 3, I have shown a unit of manufacture preferably in the form of a coil form 1 secured to a panel 2 of insulating material carrying a series of printed circuits 3 on its lower side 4. The panel 3 has an opening 5 providing a series of adjacent notches 6, which in my preferred form, I have chosen to illustrate as four. Each of the printed circuit leads has an end element 7 adjacent the outennost edge 8 of one of the notches 6 as most clearly shown in Fig. 8.

The coil form 1 which is in the form of a casting of insulating material has a core portion 9 and la base portion 10. Coils of wire (not shown) are wrapped around the core 9 in actual use of the form providing free ends which are electrically connected to the metal terminals carried by the coil form. The base portion 10 of the coil form is of greater diameter than the core portion 9 land has an upper surface 11 projecting laterally beyond the core 9 and a lower surface 12. The body 10 has a series of apertures 13, which in my preferred form I have shown to be 4 in number so as to correspond to the number of notches 6 in the panel 2, extending from the upper face 11 through the lower surface 12. The casting preferably has an inclined lead element 14 (Fig. 5) adjacent the end of each of the openings 13 intersecting the upper face 11 and an abutment 15 in contig- 2,790,961 Patented Apr. 30, 1957 uous relation to the opening 13 adjacent the lower surface 12.

The body portion 10 carries a series of four metal mounting members which are seated in assembly with the base portion within the openings 13. The mounting member, as most clearly shown in Figs. 6 and 7, is preferably formed of spring brass and includes a shank portion 16 having a laterally-extending element 17 at its upper end. The element 17 has notches 18 in opposed sides for receiving the free end of a wire coil (not shown) which is carried by the core 9. A yieldable attaching portion 19 is integrally joined to the opposite end of the shank 16 from the element 17 and includes a diverging element 20 and a converging element 21 forming an attaching shoulder 22. The shank portion 16 has a lateral protuberance in the form of la yieldable outwardly bowed element 23 intermediate the element 17 and the attaching portion 19 operable to secure the mounting member in non-rattle fastened assembly with the base portion as will be described. The bowed element 23 has a shoulder portion 24 on its concave side adjacent its junction with the straight element 25 which is positioned between the bowed element 23 and the diverging element 20.

In assembling the parts of the installation, the attaching portions 19 of the mounting members are moved into the respective openings 13 of the base portion from the upper surface 11 of the base portion. As each of the (mounting members are moved downwardly through its respective opening 13, the outwardly bowed portion 23 which has a radius less than the distance between opposed walls 26 and 27 of the opening 13 will be compressed against the inherent resilience of the metal and consequently lengthened very slightly. As insertion movement is continued, the lower end of the bowed element 23 passes through the opening 13 'at which time the shoulder 24 will engage the abutment 15 (Fig. 4) under the tendency of the bowed element to return to normal radius. When the shoulders 24 are engaged behind the abutments 15, the laterally extending elements 17 of the mounting members abut the upper surface 11 of the base portion whereby the elements 17 land the shoulders 24 cooperate to limit movement of the mounting member in upward or downward relation relative to the base portion. When the mounting members are in assembled relation to the base portion, the bowed element 23 and the shank portion 16 exert tensio'nal pressure on opposed walls 26 and 27 adjacent the openings 13 effecting a nonrattle assembly between the base portion and the mounting members which is necessary to efiicient electrical functioning of the assembly. When the mounting members are in final assembly with the base portion the notched portion of the laterally-extending elements will project beyond the peripheral walls of the base portion (Fig. 1) enabling the wire ends (not shown) to be attached and soldered thereto. At the same time, the attaching portions 19 will project beyond the lower surface 12 of the base portion for attaching engagement with the panel 2.

In assembling the coil form assembly to the panel 2, the attaching portions 19 of the mounting members are aligned with the notches 6 of the opening in the panel and the converging elements 21 are moved through the notches 6 in cammling engagement with the walls 8 of the notches. During this action the converging elements 21 will be forced inwardly until the shoulders 22 have passed through the panel at which time the attaching portions will expand under the natural resilience of the metal to engage the shoulders 22 behind the lower surface 4 of the panel 2. When the coil form is in fastened assembly with the panel, the diverging elements 22 of the attaching portions of the mounting members are seated in adjacent relation to the respective ends 7 of the printed circuits 3 and are electrically connected to the printed circuits by the application of solder 28 as shown in Fig. 4-. As a result of the soldering operation an efficient electrical connection is effected between the mounting members and the printed circuit elements and, at the same time, the coil form is firmly anchored to the panel. Thus, my improved coil form device provides a base portion of a casting having mounting members assembled in non-rattle relationship therewith and operable, not only to secure in initial attachment the coil form to a supporting panel carrying printed circuits, but also to effect an eificient electrical connection between the wire coils carried by the form and the printed circuits. In addition, my improved mounting assembly includes parts of simple and inexpensive construction capable of being manufactured and assembled in large quantities.

Although I have illustrated a preferred embodiment of my invention, 1 do not wish to be limited thereby as the scope of my invention is best defined by the following claims.

I claim:

1. A mounting assembly including a unit of manufacture having a base portion providing upper and lower surfaces, said portion having apertures extending from said upper surface through said lower surface, an abu ment adjacent each of said apertures, and a metal mounting member disposed in each of said apertures, each of said mounting members having a laterally-extending portion at one end engaging said base portion adjacent said upper surface, a shank portion having a shoulder element engaging said base behind said abutment, said shank portion having a protuberant portion between said shouldcr element and said laterally-extending portion exerting tcnsional pressure on opposed walls of said respective aperture for holding said shoulder element behind said abutment, and an attaching portion integral with the end of each of said mounting members away from said laterally-extending portion, said attaching portions extending beyond said lower surface of said base portion for engagement with a supporting structure to secure said unit thereto.

2. A mounting assembly including a coil form having a core portion about which wires may be wound and a base portion at one end of said core portion, said base portion being of greater diameter than said core portion and having upper and lower surfaces, said base portion having apertures extending from said upper surface through said lower surface, an abutment adjacent each of said apertures, and a resilient metal mounting and terminal member disposed in each of said apertures, each of said mounting and terminal members having a laterallyextending portion at one end engaging said base portion adjacent said upper surface, said laterally-extending portion having means for anchoring a wire thereto, a shank portion having a shoulder element engaging said base behind said abutment, and a yieldable attaching portion integral with the end of each of said mounting members away from said laterally-extending portion, said attaching portions extending beyond said lower surface of said base portion for engagement with a supporting structure to secure said coil form thereto.

3. A mounting assembly including a coil team having a core portion about which wires may be wound and a base portion at one end of said core portion, said base portion. being of greater diameter than said core portion and having upper and lower surfaces, said base portion having apertures extending from said upper surface through said lower surface, an abutment adjacent each of said apertures, and a resilient metal mounting and terminal member disposed in each of said apertures, each of said mounting and terminal members having a laterallyextending portion at one end engaging said base portion adjacent said upper surface, said laterally-extending portion having means for anchoring a wire thereto, a shank portion having a shoulder element engaging said base portion behind said abutment, said shank portion having a protuberant port-ion between said shoulder element and said laterally-extending portion having a width. substantially equal to the width of said respective aperture between opposed walls thereof, and la shouldered yieldable attaching portion integral with the end of each of said mounting members away from said laterally-extending portion, said attaching portions extending beyond said base portion for engagement with a supporting structure to secure said unit thereto References Cited in the file of this patent UNITED STATES PATENTS 2,230,923 B arry Feb. 4, 1941 2,353,795 Tinnerman July 18, 1944 2,525,210 Del Camp Oct. 10, 1950 2,531,911 Johnson Nov. 28, 1950 2,613,244 Del Camp Oct. 7, 1952 2,639,311 Cook May 19, 1953 2,664,548 Hall Dec. 29, 1953 FOREIGN PATENTS 9,294 Australia 1932 

